1. H.J. Gunn, MSc, School of Health Professions, Plymouth University, Plymouth, United Kingdom.
2. P. Newell, MSc, Centre for Health & Environmental Statistics, Plymouth University.
3. B. Haas, MSc, School of Health Professions, Plymouth University.
4. J.F. Marsden, PhD, School of Health Professions, Plymouth University.
5. J.A. Freeman, PhD, School of Health Professions, Plymouth University, FF21 PAHC Building, Derriford Rd, PL6 8BH 01752 588800, Plymouth, United Kingdom.